本文關(guān)鍵詞： 料倉(cāng) 卸料 顆粒脈動(dòng) 接觸力　出處：《物理學(xué)報(bào)》2017年01期 　論文類型：期刊論文

【摘要】：料倉(cāng)卸料過(guò)程中的顆粒脈動(dòng)會(huì)引起料倉(cāng)振動(dòng)甚至導(dǎo)致結(jié)構(gòu)失效.為了明晰顆粒脈動(dòng)特征,本文進(jìn)行了橢球顆粒在不同半錐角深倉(cāng)的模擬卸料實(shí)驗(yàn),將料倉(cāng)圓筒部劃分為4個(gè)固定區(qū)域以研究區(qū)域內(nèi)顆粒的運(yùn)動(dòng)信息,分析了料倉(cāng)圓筒部顆粒系統(tǒng)的運(yùn)動(dòng)特征.研究結(jié)果表明:整個(gè)卸料過(guò)程顆粒速度始終處于波動(dòng)變化中,卸料前期表現(xiàn)為大振幅、周期性的劇烈脈動(dòng),卸料后期平均速度的變化則是小振幅無(wú)規(guī)律的波動(dòng);劇烈脈動(dòng)時(shí)段各區(qū)域的顆粒層平均受力的變化規(guī)律與顆粒速度脈動(dòng)特征相似,越接近儲(chǔ)料頂端顆粒脈動(dòng)振幅越大,表現(xiàn)出更規(guī)律的周期性脈動(dòng),相鄰顆粒層間的脈動(dòng)波形相似且周期相同,劇烈脈動(dòng)過(guò)程中頂面顆粒呈周期性的自由落體運(yùn)動(dòng),該時(shí)段內(nèi)頂層顆粒每一次的自由落體運(yùn)動(dòng)都會(huì)引起該范圍內(nèi)顆粒間接觸力消失;料倉(cāng)半錐角越小時(shí)劇烈脈動(dòng)頻率越高、振幅越大且脈動(dòng)持續(xù)時(shí)間也越長(zhǎng),卸料速度越穩(wěn)定,且顆粒速度不會(huì)出現(xiàn)帶有上升趨勢(shì)的波動(dòng).研究結(jié)果可為卸料設(shè)備的安全設(shè)計(jì)提供參考.
[Abstract]:Particle pulsation in the unloading process can cause silo vibration and even lead to structural failure. In order to understand the characteristics of particle pulsation, a simulated discharge experiment of ellipsoidal particles in different semi-conical deep silo is carried out in this paper. The silo cylinder is divided into four fixed regions to study the movement information of particles in the region. The characteristics of the particle system in the silo cylinder are analyzed. The results show that the particle velocity is always fluctuating in the whole unloading process, and the early unloading stage is characterized by large amplitude and periodic sharp pulsation. The variation of average velocity at the later stage of discharge is irregular fluctuation of small amplitude. The variation law of the average force of particle layer in each region during the period of intense pulsation is similar to the characteristic of particle velocity pulsation. The closer the particle pulsation amplitude is to the top of material storage, the larger the amplitude of particle pulsation is, which shows more regular periodic fluctuation. The pulsation waveforms of adjacent particle layers are similar and the period is the same, and the particles on the top surface show periodic free falling motion in the process of intense pulsation. Every free falling movement of the top layer particles in this time period will cause the contact force between particles to disappear in this range. The smaller the semi-cone angle of the silo, the higher the frequency of intense pulsation, the larger the amplitude and the longer the duration of pulsation, and the more stable the unloading speed is. The particle velocity does not fluctuate with an upward trend. The results of the study can provide a reference for the safe design of unloading equipment.
【作者單位】： 東北農(nóng)業(yè)大學(xué)工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(批準(zhǔn)號(hào):51575098) 黑龍江省自然科學(xué)基金(批準(zhǔn)號(hào):E201322) 哈爾濱市優(yōu)秀學(xué)科帶頭人基金(批準(zhǔn)號(hào):RC2013XK006004)資助的課題~~
【分類號(hào)】：O347.7
【正文快照】： 1引言 顆粒物質(zhì)是由大量單體顆粒相互作用而形成的復(fù)雜系統(tǒng)[1],往往表現(xiàn)出類固-類液的運(yùn)動(dòng)特性[2],常被視作除固、液、氣之外的第四態(tài)物質(zhì),激起了國(guó)內(nèi)外研究者的廣泛關(guān)注.顆粒物質(zhì)的密集流動(dòng)[3]、二元混合[4]、堆積[5]、結(jié)拱堵塞[6]等更是研究的熱點(diǎn)和難點(diǎn).在食品工程、農(nóng)業(yè)

【相似文獻(xiàn)】

相關(guān)期刊論文 前3條

1 李興斯;李建宇;;接觸力優(yōu)化設(shè)計(jì)的熵正則化方法[J];應(yīng)用力學(xué)學(xué)報(bào);2006年04期

2 張伯艷;陳厚群;;LDDA動(dòng)接觸力的迭代算法[J];工程力學(xué);2007年06期

3 ;[J];;年期

相關(guān)會(huì)議論文 前2條

1 閻紹澤;吳德隆;黃鐵球;;含間隙連接碰撞鉸接觸力的雙剛度模型[A];制造業(yè)與未來(lái)中國(guó)——2002年中國(guó)機(jī)械工程學(xué)會(huì)年會(huì)論文集[C];2002年

2 張伯艷;陳厚群;;LDDA動(dòng)接觸力的迭代算法[A];首屆全國(guó)水工抗震防災(zāi)學(xué)術(shù)會(huì)議論文集[C];2006年

相關(guān)碩士學(xué)位論文 前1條

1 敖海平;氣囊拋光接觸力控制系統(tǒng)研究[D];浙江工業(yè)大學(xué);2012年

，

本文編號(hào)：1485560